Pedosphere 29(3): 400--408, 2019
ISSN 1002-0160/CN 32-1315/P
©2019 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Remediation of Organochlorine Pesticide-Contaminated Soils by Surfactant-Enhanced Washing Combined with Activated Carbon Selective Adsorption
ZHANG Shengtian1,2, HE Yue2, WU Linna3, WAN Jinzhong2, YE Mao4, LONG Tao2, YAN Zhou2, JIANG Xin2, LIN Yusuo1, LU Xiaohua3
1College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095(China);
2State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing Institute of Environmental Science, Ministry of Environmental Protection of China, Nanjing 210042(China);
3Environmental Science Research Institute, Huazhong University of Science and Technology, Wuhan 430074(China);
4State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008(China)
ABSTRACT
      Remediation of organochlorine pesticide (OCP)-contaminated soils is urgently required especially in China. The present study investigated the removal of OCPs from two soils by triton X-100 (TX-100)-enhanced washing coupled with powdered activated carbon (PAC) adsorption treatment of the solution. Two contaminated soils, including a silt clay contaminated with chlordene, 1,1-dichloro-2,2-bis(p-chlorophenyl)ethanes (DDDs), and dichlorodiphenyltrichloroethane (DDT) and a sandy loam containing chlordanes and mirex, were selected. Effects of varied operating parameters, including TX-100 dosage, liquid/soil (L/S) ratio, and extraction time, on the contaminant removal were examined. For both soils, OCP removal was clearly enhanced with increasing TX-100 in extraction solution and L/S ratio. Meanwhile, the removal efficacy was also impacted by soil texture and characteristics and contents of the contaminants. Moreover, by using PAC as an absorbent, a significant decrease in the contaminants in the extraction solutions was detected, and TX-100 could be further reused. Our investigation suggests that surfactant-enhanced washing combined with activated carbon selective adsorption would be an alternative to remediate OCP-contaminated soils.
Key Words:  chlordene,dichlorodiphenyltrichloroethane,hydrophobic organic chemicals,powdered activated carbon,sodium dodecyl benzene sulfonate,triton X-100
Citation: Zhang S T, He Y, Wu L N, Wan J Z, Ye M, Long T, Yan Z, Jiang X, Lin Y S, Lu X H. 2019. Remediation of organochlorine pesticide-contaminated soils by surfactant-enhanced washing combined with activated carbon selective adsorption. Pedosphere. 29(3):400-408.
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